It may help you to begin by drawing a picture to model this problem, labeling one side of the rectangle x+2 and the other side 2x-3 (although this step is not necessary).
1) Perimeter: The perimeter of a shape is the distance around the outside. Generally you just add up the side lengths. In the case of a rectangle, since the two lengths are the same and the two widths are the same, it can be shortened to the following formula:
All that needs to be done is to substitute the expressions given for length and width into the formula above:
Then you just need to simplify the expression on the right by distributing and combining like terms:
So the expression for the perimeter of the garden is 6x-2.
2) Area: The area of a shape is the amount of space inside of it (for which the formulas vary widely depending on the shape). The formula for the area of a rectangle is
Once again, you just need to substitute the given expressions for length and width:
In order to simplify, you will need to distribute the binomials (often call the FOIL method) and combine like terms:
So this is the expression for the area of the garden.